This limited-edition pink-and black version of the Goldtouch Ergonomic Mouse has been produced to support Breakthrough Breast Cancer. Of the £69 asking price for each mouse, distributor Keytools has said it will donate £6 to the charity.

This model costs very slightly less than the £71 conventional silver-and-black Goldtouch (which hit the market at the very end of last year), and appears to have an identical ergonomic design - the only difference we could detect is that there's no option for a left-handed or wireless model (the latter adding £24 to the price tag of the silver Goldtouch).

And the pink look is, as these things go, fairly inoffensive; it's a metallic-looking shade, and not as loud as it looks in some of the publicity photos. Not one of those 'hot pinks' so beloved of the 'laptops for ladies' brigade. Nevertheless, it doesn't look like a £69 mouse, with a generally plasticky, budget look.

It feels fairly sturdy, however, if a little on the light side. There are just two (large) buttons and a heavy-duty scrollwheel that sounds almost like a football rattle in use - we'd like this to have a looser, smoother action.

Ergonomic design

Perhaps more importantly for regular PC users is the Goldtouch mouse's ergonomic design. Everything has been tailored to keep your hand in what the maker refers to as the 'position of repose', with hand relaxed, fingers slightly 'cupped and splayed' and the thumb in the curled round shape it adopts naturally. It's meant to be the sort of hand shape you get when floating in a swimming pool, and requires the minimum muscle effort.

The key element here is the slope - the mouse 'elevates the thumb and declines at a 24-degree angle towards the little finger' - but there are also oversized, comfortable buttons and a broad, supportive shape.

And the Goldtouch Mouse is comfortable to use; whether this will reduce repetitive strain injuries in the long term is something we must largely take on trust from the manufacturer and the advertising watchdogs, but I can at least confirm that yes, the position of the hand when using this mouse is the sort of position I'd have in zero gravity - it feels relaxed, like I'm not really using a mouse at all.

But it feels odd at first, too, and you'll probably keep creeping back to the 'wrong' posture, with the hand flat. We also found that the natural posture prevented us from pressing the mouse buttons with the flat pads of our fingers, instead hitting them at a slight angle. But this grew more natural-feeling the longer we persisted.

£69 is an awful lot of money for a wired mouse, and particularly one that looks like it ought to cost £20. But if it prevents you from getting RSI, it's worth it. And the charitable donation doesn't hurt.